Standard Lemma guide

pentamethylcyclopentasiloxane

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • /ˌpɛntəˌmɛθəlˌsaɪkləʊˌsaɪləˈsɒkseɪn/ gen

1

noun

Meaning 1

A cyclic organosilicon compound consisting of a five-membered ring of alternating silicon and oxygen atoms, with five methyl groups attached to the silicon atoms. It is primarily used as a precursor in the production of specialized silicones and polymers.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable, usually

Topics: chemistry, natural-sciences, organic-chemistry, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

penta- + methyl- + cyclo- + penta- + siloxane